Wind shear hazard analysis
Why is low-altitude wind shear harmful? This is a feature of wind shear. For example, the most harmful red air is the main feature of the wind shear zone, according to the vertical wind shear on the earth. There is a great velocity gradient, and due to the vertical movement in the horizontal direction, that is, the sudden strengthening of the vertical movement wind direction, a particularly strong downward airflow is generated, which is the so-called micro-jet airflow. This limited area of strong downward airflow, after turning in parallel, collides with the ground and becomes horizontal wind speed. The influence of wind direction diverges at the center of the circle surrounded by a larger area, forming horizontal wind shear. If the plane enters this field during take-off and landing, it may lead to collapse. For example, when the plane lands, it just passes through the descending channel of micro-airflow, then the plane will suddenly descend abnormally and deviate from the original taxiway, which may be very dangerous. We know that when the downwind airflow enters the slightly descending airflow, the relative speed between the aircraft and the airflow suddenly decreases. Because the aircraft is constantly decelerating during landing, the flight speed of the aircraft must be greater than the minimum speed without flameout. Sudden deceleration may cause the aircraft to enter a stall state, and the flight attitude is uncontrollable. It is impossible to restore control at such a low altitude and speed, and the left-seat pilot has space and time, thus causing a flight accident.
Severe low-level wind shear often occurs in low-level jet stream and narrow strong wind, which poses a great threat to flight safety. This kind of wind shear flow often rushes from a height, like pouring down. When the plane enters the area with strong headwind, in the first case, under the condition of severe downwind, the plane is thrown out like a huge faucet, so it is prone to serious collapse.